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=============================================================================
FreeBSD-SA-12:03.bind                                       Security Advisory
                                                          The FreeBSD Project

Topic:          Incorrect handling of zero-length RDATA fields in named(8)

Category:       contrib
Module:         bind
Announced:      2012-06-12
Credits:        Dan Luther, Jeffrey A. Spain
Affects:        All supported versions of FreeBSD
Corrected:      2012-06-12 12:10:10 UTC (RELENG_7, 7.4-STABLE)
                2012-06-12 12:10:10 UTC (RELENG_7_4, 7.4-RELEASE-p9)
                2012-06-04 22:21:55 UTC (RELENG_8, 8.3-STABLE)
                2012-06-12 12:10:10 UTC (RELENG_8_3, 8.3-RELEASE-p3)
                2012-06-12 12:10:10 UTC (RELENG_8_2, 8.2-RELEASE-p9)
                2012-06-12 12:10:10 UTC (RELENG_8_1, 8.1-RELEASE-p11)
                2012-06-04 22:14:33 UTC (RELENG_9, 9.0-STABLE)
                2012-06-12 12:10:10 UTC (RELENG_9_0, 9.0-RELEASE-p3)
CVE Name:       CVE-2012-1667

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.

I.   Background

BIND 9 is an implementation of the Domain Name System (DNS) protocols.
The named(8) daemon is an Internet Domain Name Server.

II.  Problem Description

The named(8) server does not properly handle DNS resource records where
the RDATA field is zero length, which may cause various issues for the
servers handling them.

III. Impact

Resolving servers may crash or disclose some portion of memory to the
client.  Authoritative servers may crash on restart after transferring a
zone containing records with zero-length RDATA fields.  These would
result in a denial of service, or leak of sensitive information.

IV.  Workaround

No workaround is available, but systems not running the BIND name
server are not affected.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 7-STABLE, 8-STABLE, or 9-STABLE,
or to the RELENG_7_4, RELENG_8_3, RELENG_8_2, RELENG_8_1, or RELENG_9_0
security branch dated after the correction date.

2) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to FreeBSD 7.4,
8.3, 8.2, 8.1 and 9.0 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

[FreeBSD 7.4-RELEASE, 8.3-RELEASE, 8.2-RELEASE, and 8.1-RELEASE]
# fetch http://security.FreeBSD.org/patches/SA-12:03/bind.patch
# fetch http://security.FreeBSD.org/patches/SA-12:03/bind.patch.asc

[FreeBSD 9.0-RELEASE]
# fetch http://security.FreeBSD.org/patches/SA-12:03/bind-90.patch
# fetch http://security.FreeBSD.org/patches/SA-12:03/bind-90.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/bind/
# make obj && make depend && make && make install
# cd /usr/src/usr.sbin/named
# make obj && make depend && make && make install

3) To update your vulnerable system via a binary patch:

Systems running 7.4-RELEASE, 8.3-RELEASE, 8.2-RELEASE, 8.1-RELEASE,
or 9.0-RELEASE on the i386 or amd64 platforms can be updated via the
freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

4) Install and run BIND from the Ports Collection after the correction
date.  The following versions and newer versions of BIND installed from
the Ports Collection are not affected by this vulnerability:

        bind96-9.6.3.1.ESV.R7.1
        bind97-9.7.6.1
        bind98-9.8.3.1
        bind99-9.9.1.1

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

CVS:

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_7
  src/contrib/bind9/lib/dns/rdata.c                           1.1.1.5.2.4
  src/contrib/bind9/lib/dns/rdataslab.c                       1.1.1.2.2.5
RELENG_7_4
  src/UPDATING                                            1.507.2.36.2.11
  src/sys/conf/newvers.sh                                  1.72.2.18.2.14
  src/contrib/bind9/lib/dns/rdata.c                       1.1.1.5.2.1.2.1
  src/contrib/bind9/lib/dns/rdataslab.c                   1.1.1.2.2.3.2.1
RELENG_8
  src/contrib/bind9/lib/dns/rdata.c                               1.2.2.4
  src/contrib/bind9/lib/dns/rdataslab.c                           1.2.2.5
RELENG_8_3
  src/UPDATING                                             1.632.2.26.2.5
  src/sys/conf/newvers.sh                                   1.83.2.15.2.7
  src/contrib/bind9/lib/dns/rdata.c                           1.2.2.2.2.1
  src/contrib/bind9/lib/dns/rdataslab.c                       1.2.2.3.2.1
RELENG_8_2
  src/UPDATING                                            1.632.2.19.2.11
  src/sys/conf/newvers.sh                                  1.83.2.12.2.14
  src/contrib/bind9/lib/dns/rdata.c                               1.2.8.1
  src/contrib/bind9/lib/dns/rdataslab.c                       1.2.2.2.2.1
RELENG_8_1
  src/UPDATING                                            1.632.2.14.2.14
  src/sys/conf/newvers.sh                                  1.83.2.10.2.15
  src/contrib/bind9/lib/dns/rdata.c                               1.2.6.1
  src/contrib/bind9/lib/dns/rdataslab.c                       1.2.2.1.2.1
RELENG_9
  src/contrib/bind9/lib/dns/rdata.c                               1.5.2.2
  src/contrib/bind9/lib/dns/rdataslab.c                           1.7.2.2
RELENG_9_0
  src/UPDATING                                              1.702.2.4.2.5
  src/sys/conf/newvers.sh                                    1.95.2.4.2.7
  src/contrib/bind9/lib/dns/rdata.c                               1.5.4.1
  src/contrib/bind9/lib/dns/rdataslab.c                           1.7.4.1
- -------------------------------------------------------------------------

Subversion:

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/7/                                                         r236953
releng/7.4/                                                       r236953
stable/8/                                                         r236590
releng/8.3/                                                       r236953
releng/8.2/                                                       r236953
releng/8.1/                                                       r236953
stable/9/                                                         r236587
releng/9.0/                                                       r236953
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1667
http://www.isc.org/software/bind/advisories/cve-2012-1667

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-12:03.bind.asc
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